Well, it's not the front hole (where I believe the Wah Switch is), but the pivoting cylinder that's toward the middle. You're right, there's a foam shield that came unglued, allowing light to enter through that opening. I was able to duplicate the problem in sunlight, bummer because had it been the front part it would've been easier to fix.

For now I'll leave it alone, while searching for a suitable material to cover that piece without affecting the pedal function. If I can figure out how to safely remove the pedal I can build a type of bellows to attach to it, otherwise it'll be temp fixes, which I don't like.

IMO, it's a cheap design but no worse than digitech using binder clips for their switch springs. 

Thanks again Silverhead. I'll post pix when I get something going.